# 50+ Escape Speed MCQs and Answers

Escape Speed MCQs and Answers play important role in various entrance test so students can practice online Gravitation quiz to attempt these MCQ’s. Gravitation is one of the most difficult chapter to master in Physics. While solving this topic it becomes more complicated due to lengthy theory. So students often stuck at that point while writing exams like JEE, NEET etc. Students don’t know how to tackle the exam questions on Gravitation. Here you will get all the details regarding Gravity MCQs and answers. We already published the most important Questions and Answers on the Chapter Gravitation.

## Escape Speed MCQs and Answers

a) R/2

b) R

c) 2R

d) 4R

a) (pr)1/2

b) (p/r)1/2

c) (pr)

d) (p/r)

#### 3. What is the minimum velocity required for an object of mass “m” to escape the gravitational pull of a planet of mass “M” and radius “R” from its surface?

a) [(G*M)/R]1/2

b) [(2*G*M)/R] 2

c) [(G*M*m)/R]1/2

d) [(2*G*M)/R]1/2

a) True

b) False

a) v/(k2-1)1/2

b) v(k2-1)1/2

c) v2/(k2-1)

d) v2 (k2-1)

#### 6. The earth is able to retain its atmosphere because of _____

a) the mean velocities of atmospheric gas molecules which is less than that of the earth’s escape velocity

b) the mean velocities of atmospheric gas molecules which is greater than that of the earth’s escape velocity

c) the gravitational effect of the moon

d) the earth’s magnetic field

#### 7. The escape velocity at the event horizon of a black hole is 3×108 m/s, i.e., the velocity of light. What is the mass of the black hole if the distance from its centre to the event horizon is 18km?

a) 12.15 x 10-30 kg

b) 12.15 x 1030 kg

c) Infinity

d) Cannot be determined

a) True

b) False

a) 0.07 times

b) 0.7 times

c) 7 times

d) 3.7 times

a) True

b) False

a) True

b) False

#### 12. A planet as a radius “R” and density “P”. The escape velocity of this planet is _____

a) directly proportional to P

b) inversely proportional to P

c) directly proportional to P1/2

d) inversely proportional to P1/2

#### 13. A particle is kept at a distance R above the earth’s surface. What is the minimum speed with which it should be projected so that it does not return?

a) [(G*M)/(4*R)]1/2

b) [(G*M)/(2*R)]1/2

c) [(G*M)/R] ½

d) [(2*G*M)/R]1/2

#### 14. The radius of Jupiter is approximately 11 times larger than the earth. Jupiter has a mass 316 times that of earth. What is the approximate escape velocity of Jupiter compared to earth?

a) 100 times greater

b) 12 times greater

c) 5 times greater

d) Equal to that of the earth

#### 15. If the earth lost 99% of its mass, the escape velocity would _____

a) increase 10 times

b) decrease 10 times

c) decrease 90 times

d) increase 90 times